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Sorry if this has already been a thread before,
but i recently got picked up an 07' Impreza S-GT, 2.0 Turbo 5 Speed. Excellent car and I'm having a blast driving it.
Anyway, the car has just under 170000 k's and I believe it's time for me to do a service - oil, filter, etc.
What are some other things you guys generally do when servicing your turbo Subaru's? I was having a gander at servicing videos and the general service seemed to include cleaning the AFM, resetting the ECU, and top engine cleaning? I feel like some of it is a bit unnecessary but and pointers are greatly appreciated. I feel and oil and filter change would be sufficient enough?
Found something broken, converted to parallel until I can replace said part (secondary bypass valve thing) and thought I\'d put this up, the internet makes it seem like such a hard job - it isn\'t. Changing oil takes longer.
First off - this is the *Free* way to do this, takes you 20 minutes, and is 100% reversible in the same amount of time (you don\'t even need to cut any hoses, nothing). It will not be as good as a dedicated setup (with parallel headers etc) and not as good again as a single setup - however there\'s a lot to be said for cost. All this is doing is short-cutting the TT system to lock it into the same arrangement as is normal above 4500, so no you will do the car no damage and have nothing to lose.
Secondly - if I\'ve gotten things wrong, please tell me. The reason I wrote this up is when googling for the diagram smurff put up years ago (which is down the bottom) I just found link after link of people either asking how to do it, know-it-alls going on about "I think it\'d be terrible, just convert to single turbo" without trying it, or people thinking it was a horrendous job of re-wiring, replumbing and confusion. You can make up your own mind about how it drives, some love it, some think it\'s a pig - I put some examples at the end of how mine drives.
So first thing: Loosen off the heat shield on the secondary turbo. You don\'t need to remove it outright - just take off the two bolts on top and the one down close to the chassis rail. There\'s a bastard of one tucked underneath, but once you remove those 3 you can tilt it right back.
Yay now you have access to the exhaust valve actuator rod - notice how it\'s threaded? Slightly off topic you can noticably change the behavior of the car by lengthening and shortening this rod, bit of trial and error but you can improve VOD and secondary spool a bit, bit of a balancing act.
ANYWAY - unscrew this right out. It\'s a reverse thread, and the locking nuts can get pretty stuck on there too. Keep winding until the little hexagonal rod falls off, or hopefully you grabbed it before it fell and got stuck in the steering rack.
Now it\'s pretty tight, but try and wire the bottom half of the rod down, basically rod down = valve open. It holds itself down anyway but may as well keep it there. IF you were doing this permanently, you would either remove the valve, or make a new up-pipe. The piping guide at the bottom suggests tricking the car into permanently opening it with pressure - I just took the short cut.
Now put the heat shield back on.
There is a vacuum hose going to this valve - this is the one which opens and closes the secondary turbo off from the intercooler outlet. It\'s held closed by vacuum... So pull the hose off, its spring loaded to stick open. Done. In theory you now have the TT system stuck open. (Oh yeah, block the hose off)
Last thing - you need to block the secondary dump valve OR tee it into your other BOV, it\'s the relief valve the TT system uses to pre-spool the secondary (the hose which runs from secondary turbo, to a plastic arm, then a black thing which is just a BOV but not used as one... sort of). Mine has a massive bolt in the hose (cause I\'m redneck bro) and this is temporary, what you are MEANT to do is to tee it into the main BOV line. I would have, but this thing being snapped is the reason I did this in the first place so uh.. yeah.
In theory you can now go for a drive, and then watch the check engine light come on after the first few times you floor it.
Reason being - the ECU in these things has a MAP sensor with the sole job of watching for boost to be on just primary, then on both to make sure the TT system is functioning correctly. One side of it goes after the intercooler valve and is watching primary boost, the other is in the plastic arm to the secondary relief valve thing.
Luckily here\'s something Subaru prepared earlier - the hose which goes to the TOP of the exhaust valve actuator conveniently has nothing coming through it until about 4 grand when it starts to get boost through it. You unplug this - and instead join it to the hose going to the map sensor. Pro photo mid-work below - if you\'ve replaced your hoses with pretty ones, the hose you use is the back one of the two running up the firewall. Blank off the hose which ran from the plastic arm bit, it has no use now. The hose to the top of the ECV is number 8, and the one to the MAP sensor is number 22. FYI the one to the bottom of the ECV gets vacuum only as a way of being able to half-open the valve.
Now that is literally it - there is no messing around with wiring, if you want to undo this (and to be honest it\'s quite likely you will) you just reverse what has been done. Just don\'t burn your hands.
So - how does it drive - whats the benefits and why would you do this?
I don\'t know if my car is a prime example but here\'s what I have found anyway - it\'s laggy and the long legs the legacy got makes things worse. Best comparison I can give is it\'s similar to an 1.8L GSR with a TD05, pretty doughy down low but worth it once it wakes up. Basically feels n/a below 3500.
5th gear @ 3k (100kph ish) gets you about 0.5-0.6 bar boost and a corresponding lack of speed. Dropping to fourth at the same speed (about 4 grand?) it will hit about 1 bar in around a second - in comparison with it TT it would spool the primary, hit VOD in an instant and then start to spool. From a standing start or dropping back a gear on the move it (parallel) canes the TT (sequential) setup as it just wakes both up, however say goodbye to getting a kick from booting it in second on a roll like you used to. I haven\'t driven something with one of the z/s sequential controllers on - so can\'t comment on how it compares to that.
The sound is drastically changed - it has a hint of the normal burble at idle but to be fair it sounds like ass until it starts to get some boost into it. Not much different to tuned length headers or a non turbo suby I guess - once it does get some boost on board I love it, sounds like nothing else.
IF I was to carry on with this I\'d be looking to get some proper headers and downpipes for it and try to improve the spool up, mine still has factory downpipes including primary cat which won\'t be helping matters.
You *could* look to use a V5/6 ecu as per a normal single conversion - and that\'d make sense to do - but isn\'t quite so reversable and involves spending $$ (I understand there is a difference in CR 8.5 / 9.0 between STi and B4?). If you could get the spool up improved a bit it\'d be a pretty sweet way to do things. I have seen it mentioned that some remove (and block off) the joiner pipe which connects left and right banks - the problem there is that you lose boost control to the 2ndry turbo - at the moment when the single WG on the primary vents, it\'s dumping gas from the whole manifold hence why it works just fine. I get absolutely 0 spiking or flickering on boost with the way things are now. In terms of outright speed - pass? 0-100 times are a bit hard to compare, 0-400m won\'t happen with this car - I timed it at under 3.5 sec 80-120k so it\'s got pace enough for me at least.
To do this to a BG/BD it is effectively the same - not sure if the hoses are numbered the same, but where they run to and from is.
I\'ve tried and tried to get it to throw a CEL at me but so far so good, things seem happy (touch wood).
Here\'s the diagrams as well - only thing I do different is not doing anything with the ECV hoses. Writing this post up took me 3 times as long but I know some find a diagram way way harder to follow than just a photo.
Anyway - have fun
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Hi all. So I've just seen on Facebook about a thing called The Gumboot rally it's on the weekend of the 7th of April. Goes from Hamilton somewhere down to New Plymouth then across to Taupo and also includes The Forgotten Highway which is an awesome road to drive, as I have done it a few times now. If you are interested go have a look on Facebook should be a fun weekend I reckon.· 1 reply
Stay safe on the roads over this time there are some CRAZY people out there who only think about themselves!!
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